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TT 105 Quiz 3 Review Fall 06

TT 105 Quiz 3 Review Fall 06 - Review For TT Test 3 All of...

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Review For TT Test 3: All of these Statements are true! Preparation involves the preparing the fabric for dyeing, printing or finishing. Scouring removes stains, oils and waxes. Bleaching can be classified as being a half or full bleaching action. Bleaching improves fabric whiteness and luster but reduces the strength of cotton. Dyeing is an application of color and the color can adsorb onto the fabric surface or absorb into the fibers. Printing is a selective application of color and the color may stay on the surface or diffuse into the fiber. Objectives in dyeing require the proper shade and an adequate fastness to light and to washing. Dyeing involves an intentional color change with a specified degree of color permanence. Staining can be accidental or intentional. If staining is intentional, the temporary color change can be used for identification purposes. Staining products for identification purposes involves a fugitive (i.e., temporary) dyeing process. Factors influencing shade include the light source used, the age and sex of the observer, fatigue, the fabric surface or texture and the liquor ratio (amount of liguid to fabric weight) used in dyeing. Typical factors influencing dyeing include the liquor ratio used, fiber characteristics, machine type used and it’s characteristics, the temperature used, the dye concentration and the characteristics of any additives used. Fiber dyeing techniques include stock dyeing and solution (also called dope) dyeing. Stock dyeing is semi-permanent and involves the dyeing of a small amount of fiber and it is later mixed with undyed fiber. Stock dyeing is used to create the gray filling yarn used in some denim. Solution or dope dyeing is used with filament yarns only, color is put into a polymer then spun; color is permanent. Yarn dyeing can be done by skein dyeing, by package dyeing and beam dyeing techniques. Fabric dyeing can be done by piece dyeing where an entire piece of fabric is dyed. In union dyeing two different fibers are dyed to the same shade. In cross dyeing two different fibers are dyed to different colors or shades. Fabric dyeing can be done by batch dyeing where a dye in solution form is moved through the goods or the goods are moved through the dye solution. Continuous dyeing involves continuous dyeing in which dyestuff in solution is applied evenly and continually across the full width of the fabric by a padding action then the dye (dyestuff) is fixed by chemical or thermal means. Continuous dyeing requires long, continuous lengths of fabric. Batch dyeing can be done by jig dyeing, beck dyeing or jet dyeing techniques. Beck dyeing involves pulling a fabric in and out of solution therefore fabric shrinkage levels are a problem. Jet dyeing involves the pushing of fabric through a dye solution therefore shrinkage is much less of a problem.
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